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Welcome to Guildline

Guildline Instruments is an Engineering Company that designs, manufactures and markets ultra-precise instruments for the fields of metrology and oceanography. Since 1957 our products have been used for research and as the primary instrument with respect to establishing traceability to fundamental electrical standards. Key customer markets include national research laboratories, national metrology institutes, calibration laboratories, militaries, nuclear power plants, aerospace, and companies in the electrical and power industry.

guildline logo 50years

Most Guildline instruments are unique and represent the only commercially available instrument capable of uncertainties/accuracy in the sub parts-per-million range. The team of Guildline engineering and manufacturing experts is recognized around the world for the performance and quality of the Company’s products. Most Guildline Instruments and Standards remain in use for 20 to 50 years – performance and quality that customers depend on!

Contact Guildline to assist you in overcoming all of your measurement challenges. Performance and quality for over 60 years!

What's New

  • 6624CT-3000

    Guildline's 6624CT-3000 DC High Current Transformer provides very accurate DC current measurements up to 3000 Amperes. The direct current transformer is designed with an open window to pass a single cable, set of cables, or buss bar that carry the direct current to be measured. The 6624CT-3000 High Current DC Current Transformer produces an output current that varies directly with the input current in three ranges.

    Download the Datasheet:

    31477-00-85_CZ6624CT-3000.pdf